Don't forget that Achievements don't work if you activate a Cheat! Keep clean to earn this award.
Only Franklin can purchase this property and recieve the request.
Buy the cab company as Franklin, it costs $200,000. Once you have bought it you want to wait until Raul calls you up. He will let you kow that he will call you whenever there is jobs. Now, after a while you will get a phone call saying somebody needs to be picked up (Not the regular taxi pick ups!). Accept the job then go to the "P" on the map. Complete the fare and the trophy / achievement will unlock.